CSA #11 on cover postmarked ATLANTA, GA., JUL 17 sent to Mr. J. H. Larrel, Rock Island Paper Mill, Columbus, Ga.
According to the Historical Collections of Georgia website, the Rock Island Paper Mill is situated on the Chattahoochee River, 2 1/2 miles above Columbus, partly in Georgia, and partly in Alabama. The machinery is prepared for making all kinds of writing, printing, and wrapping paper; capable of manufacturing 2,500 pounds of paper per day; consuming 3,000 pounds of rags daily.